Listen, O Israel! The Lord is our God, the Lord alone. [Deuteronomy 6:4 (NLT)]
In spite of a chef’s mirepoix being called a “holy trinity,” understanding our triune God is harder than making or appreciating a good sauce. In a mirepoix, once the vegetables are combined and sautéed, they are no longer distinct—not so with the Holy Trinity. Even when combined, all three persons of the Trinity retain their individuality. Rather than a mirepoix recipe, perhaps the chef’s cookbook might make a better analogy. Having length, width and thickness, it is three-dimensional. Its length is not its width, its thickness is not its length, and its width is not its thickness. Each can be described differently as separate and distinct measurements and yet they are all connected together in one book. If you remove any one of the dimensions, you no longer have a book. We could think of the Godhead being like a cookbook that has three unique dimensions that combine to make up the mass of the entirety.
So, is the Godhead the sum of its three parts? If we add one (the Father) to one (the Son) to one (the Holy Spirit), we end up with three. This poses a problem since God clearly tells us He is only one. Let’s think about that cookbook again. If we wanted to know the mass of that book, rather than add the parts, we would multiply the length times the width times the thickness. If we want to know the magnitude of the Holy Trinity, we multiply one (the Father) times one (the Son) times one (the Holy Spirit) and come out with one: the Godhead!
That we worship one God in Trinity, and Trinity in Unity, neither confounding the persons, nor dividing the substance. For there is one Person of the Father, another of the Son, and another of the Holy Spirit. But the godhead of the Father, of the Son, and of the Holy Spirit, is all one, the glory equal, the majesty co-eternal. [Athanasian Creed]
Jesus replied, “The most important commandment is this: ‘Listen, O Israel! The Lord our God is the one and only Lord. [Mark 12:29 (NLT)]